Solve: Square Root Product (√16 × √25) Plus Power of 8 Expression

The given expression is: $\sqrt{16}\times\sqrt{25}+8^3\times3$.

First, calculate the square roots: $\sqrt{16} = 4$ and $\sqrt{25} = 5$.

Multiply the square roots: $4 \times 5 = 20$.

Next, calculate the cube: $8^3 = 512$.

Multiply the result by 3: $512 \times 3 = 1536$.

Finally, add the two results: $20 + 1536 = 1556$.

Thus, the answer is: $1552$.